rust/src/test/compile-fail/mutable-arguments.rs

// Note: it would be nice to give fewer warnings in these cases.

fn mutate_by_mut_ref(&x: uint) {
    x = 0u;
}

fn mutate_by_ref(&&x: uint) {
    //!^ WARNING unused variable: `x`
    x = 0u; //! ERROR assigning to argument
}

fn mutate_by_val(++x: uint) {
    //!^ WARNING unused variable: `x`
    x = 0u; //! ERROR assigning to argument
}

fn mutate_by_copy(+x: uint) {
    //!^ WARNING unused variable: `x`
    x = 0u; //! ERROR assigning to argument
    //!^ WARNING value assigned to `x` is never read
}

fn mutate_by_move(-x: uint) {
    //!^ WARNING unused variable: `x`
    x = 0u; //! ERROR assigning to argument
    //!^ WARNING value assigned to `x` is never read
}

fn main() {
}